Bosch HC6521 2-1/2-Inch x 18-Inch x 24-Inch Wild Bore Thru-Hole Multi-Cutter Head SDS Max Rotary Hammer Bit Go to amazon.com Related posts List of the Top 10 cutter head you can buy in 2022 FeatureCarbide tipped bit head is harder, tougher, and more resistant to extreme loads2-1/2" diameter, 18" useable length, 24" overall length DescriptionIncludes 2-1/2-inx18-inx24 in. SDS-max Wild Bore Thru-Hole Rotary Hammer Bit - HC6521